BB Harmonic Balancer

[Ted S.]

What was harmonic balancer 3870325 used for?

Thanks,

Ted

[Clem Z.]

Re: BB Harmonic Balancer

my book says 1969 L-72 chevelle

[Ted S.]

Re: BB Harmonic Balancer

The 3870325 is cast into the center hub. Is that also the GM part number (vs a casting number that they used to make various balancers out of)? It is an 8" big block balancer, so I thought it was for hipo applications. Were 8" big block balancers used for non hipo applications?

TIA

Ted
NCRS #30057

[Craig S.]

Re: BB Harmonic Balancer

I am not sure in the older cars, but, my 81 454 pickup has an 8" balancer....Craig

[Joe L.]

Re: BB Harmonic Balancer

Ted----

The number that you are referring to is a casting number for the balancer hub section; it is not a part number for a complete balancer assembly. That hub may or may not have been used for several balancers.

The 3870325 hub was a non-counterweighted balancer hub. So, the balancer that you have is very likely one of the 66-70 balancers used for SHP 396, 402, and 427 engine applications.